Global Patent Index - EP 0688769 B1

EP 0688769 B1 2000-03-22 - Method of preparation of the 2-coumaranone

Title (en)

Method of preparation of the 2-coumaranone

Title (de)

Verfahren zur Herstellung von 2-Coumaranon

Title (fr)

Méthode de préparation de la 2-coumaranone

Publication

EP 0688769 B1 (FR)

Application

EP 95401385 A

Priority

FR 9407651 A

Abstract (en)

[origin: EP0688769A1] Prodn. of 2-coumaranone (I) is by: (1) vapour-phase reaction of glyoxylic acid (II) with cyclohexanone (III) in the presence of a dehydrogenation catalyst; (2) vapour-phase contacting a crude reaction mixt. with a dehydrogenation catalyst, the reaction mixt. being obtained by condensn. of (II) with (III) in known manner; or (3) vapour-phase contacting a cyclohexanone-2-acetic acid (IV) and/or cyclohexanol-2-acetic acid (V) soln. with a dehydrogenation catalyst. Carrier gas comprising N2 and/or H2 is used. Reaction temp. is at least 150 deg.C. Catalyst comprises Pd or Pt on inert support with surface area above 1 (esp. above 50) m2/g. In processes (1) and (2), soln. of (II) and (III) in HOAc or HOAc/H2O is used and by-produced (IV) and (V) are recycled.

IPC 1-7 (main, further and additional classification)

C07D 307/83

IPC 8 full level (invention and additional information)

B01J 23/42 (2006.01); B01J 23/44 (2006.01); C07B 61/00 (2006.01); C07D 307/83 (2006.01)

CPC (invention and additional information)

C07D 307/83 (2013.01); Y02P 20/582 (2015.11)

Designated contracting state (EPC)

AT BE CH DE ES FR GB IT LI LU NL SE

EPO simple patent family

EP 0688769 A1 19951227; EP 0688769 B1 20000322; AT 190976 T 20000415; CN 1059209 C 20001206; CN 1120540 A 19960417; DE 69515731 D1 20000427; DE 69515731 T2 20000706; ES 2143601 T3 20000516; FR 2721609 A1 19951229; FR 2721609 B1 19961004; JP 3746091 B2 20060215; JP H0812662 A 19960116; US 5616733 A 19970401

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